adb is not used in Widows (gui) per say. It is a command line function that is used by the "Run" command on your computer, which brings up a windows "box" from where the commands are run. In Widows (not sure about 7), click start, then run. When the widows box (window) opens type cmd. Then you use the cd command to path to your android-sdk-windows/tools subdirectory, using the window that is open to execute your adb commands. You just need to understand that when doing all of this root "stuff', you need a little ability with non-gui "command line prompts". For the PC side, Dos Command Line Prompts. On the phone, Linux/Unix commands.

This is on page 4 of this forum. Rather than trying to walk you through from my side, this should cover all the bases. Right now it sounds to me you are at the "enable usb debugging mode on your phone" step, but I am just a newb trying to help.